Phase morphology, fracture toughness and failure mechanisms in super-toughened PLA/PB-g-SAN/PMMA ternary blends: A quantitative analysis of crack resistance

被引：24

作者：

Mazidi, Majid Mehrabi ^{[1
]}

Berahman, Reyhaneh ^{[1
]}

Edalat, Arman ^{[1
]}

机构：

[1] Sahand Univ Technol, Fac Polymer Engn, Inst Polymer Mat, Sahand New Town 513351996, Tabriz, Iran

来源：

POLYMER TESTING | 2018年 / 67卷

关键词：

PLA; Ternary blend; Phase adhesion; Morphology; Fracture works; Shear yielding; MICROMECHANICAL DEFORMATION PROCESSES; FILLED SEMICRYSTALLINE POLYMERS; POLY(LACTIC ACID); POLYLACTIDE; COPOLYMER; GLYCOL;

D O I：

10.1016/j.polymertesting.2018.03.028

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of poly(methyl methacrylate) (PMMA) content on the fracture resistance, failure mechanisms and micromechanical deformation of poly(lactic acid) (PLA)/polybutadiene-g-poly(styrene-co-acrylonitrile) (PB-g-SAN) blend was studied. The fracture toughness of samples was characterized by the essential work of fracture (EWF) method. The specific EWF (w(e)) linearly increased with PMMA content up to 30 wt%, indicating improved fracture toughness of ternary blends with PMMA content. The specific plastic work (beta wp) increased at first with PMMA content up to 15 wt% and then decreased at higher loadings of PMMA. The energy dissipated during yielding (w(e,y)) and subsequent tearing (w(e,t)) stages was determined by the energy partitioning approach. Both w(e,y) and w(e,t) components monotonically increased with PMMA content in ternary blends, suggesting enhanced material resistance against crack initiation and subsequent crack propagation. Fracture behavior and toughening mechanisms were studied. Suitable interfacial adhesion, cavitation of rubber particles and irreversible plastic growth of micro-voids caused massive shear yielding of matrix material in the super-toughened blends.

引用

页码：380 / 391

页数：12